diff --git a/docs/superpowers/evidence/disk-cleanup-check-split-2026-08-16.json b/docs/superpowers/evidence/disk-cleanup-check-split-2026-08-16.json
new file mode 100644
index 00000000..d1416170
--- /dev/null
+++ b/docs/superpowers/evidence/disk-cleanup-check-split-2026-08-16.json
@@ -0,0 +1,43 @@
+{
+  "intent": "Bring meta/scripts/disk_cleanup_check.sh (329 lines) under the 250-line cap by moving its formatting, sizing, confirmation and output helpers into a sourced lib.",
+  "scope": [
+    "meta/scripts/disk_cleanup_check.sh",
+    "meta/scripts/lib/disk_cleanup_common.sh (new)",
+    "Non-goal: no change to which directories are checked, what is reported, or what --clean deletes"
+  ],
+  "changes": [
+    "Move the six colour constants and human_readable/dir_size_kb/report/confirm/try_clean into lib/disk_cleanup_common.sh.",
+    "Move the report-only loop and the summary block into print_report_only and print_summary in the same lib; the entry script now ends with two calls.",
+    "Add SCRIPT_DIR resolved from BASH_SOURCE so the source line works from any cwd, and set CLEAN/TOTAL_RECLAIMABLE before sourcing, since confirm reads CLEAN and report accumulates into TOTAL_RECLAIMABLE."
+  ],
+  "verification": [
+    {
+      "command": "meta/scripts/trace_shell_split.sh <script> --stub du --out before.txt (detached worktree at the pre-split commit), then again after the split, then diff",
+      "result": "pass",
+      "evidence": "TRACE IDENTICAL -- exit status, the ordered list of stubbed `du -sk` calls, stdout and stderr all byte-identical. This is the check that matters here: the seam passes state (report mutates TOTAL_RECLAIMABLE, confirm reads CLEAN), so a static check could not have caught a break."
+    },
+    {
+      "command": "bash ~/testsAndMisc/meta/scripts/disk_cleanup_check.sh (run for real from /tmp, not from the script's own directory)",
+      "result": "pass",
+      "evidence": "exit 0, full report against real data: 303.7 GB auto-reclaimable, current usage 1445.6 GB / 3665.4 GB (42%). Running from a different cwd confirms SCRIPT_DIR resolves the lib correctly -- a known failure mode for split scripts. Dry-run default, nothing deleted."
+    },
+    {
+      "command": "bash -n + shellcheck -x on the entry, shellcheck on the lib, shfmt -d on both",
+      "result": "pass",
+      "evidence": "All exit 0 with no output. An initial SC2034 (RED appears unused) was resolved by moving print_report_only -- which uses RED -- into the lib, rather than by adding a suppression."
+    },
+    {
+      "command": "bash ~/utils/scripts/check_file_length.sh on both files",
+      "result": "pass",
+      "evidence": "329 -> 230 (entry) + 124 (lib), both under the 250 cap."
+    }
+  ],
+  "risks": [
+    "The lib depends on CLEAN and TOTAL_RECLAIMABLE being set by the caller before it is sourced. That is documented in its header comment; sourcing it standalone would leave confirm reading an unset CLEAN.",
+    "`bc` was briefly stubbed during the first baseline attempt, which produced 'printf: invalid number' noise -- bc is a calculator, not a mutator. The recorded baseline uses real bc and has empty stderr."
+  ],
+  "rollback": [
+    "git revert the commit; the helpers return inline and lib/disk_cleanup_common.sh disappears.",
+    "Re-run the script from any directory and confirm it prints the analysis table and a non-zero total."
+  ]
+}
diff --git a/meta/scripts/disk_cleanup_check.sh b/meta/scripts/disk_cleanup_check.sh
index 49beab66..ff201d31 100755
--- a/meta/scripts/disk_cleanup_check.sh
+++ b/meta/scripts/disk_cleanup_check.sh
@@ -7,13 +7,10 @@
 #
 # Safe by default: nothing is deleted without --clean AND user confirmation.
 
-RED=$'\033[0;31m'
-GREEN=$'\033[0;32m'
-YELLOW=$'\033[1;33m'
-CYAN=$'\033[0;36m'
-BOLD=$'\033[1m'
-RESET=$'\033[0m'
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
+# CLEAN and TOTAL_RECLAIMABLE must exist before the helpers are sourced:
+# `confirm` reads CLEAN and `report` accumulates into TOTAL_RECLAIMABLE.
 CLEAN=false
 if [[ "${1:-}" == "--clean" ]]; then
 	CLEAN=true
@@ -21,65 +18,8 @@ fi
 
 TOTAL_RECLAIMABLE=0
 
-# ───────────────────── helpers ─────────────────────
-
-human_readable() {
-	local kb=$1
-	if ((kb >= 1048576)); then
-		printf "%.1f GB" "$(echo "scale=1; $kb / 1048576" | bc)"
-	elif ((kb >= 1024)); then
-		printf "%.1f MB" "$(echo "scale=1; $kb / 1024" | bc)"
-	else
-		printf "%d KB" "$kb"
-	fi
-}
-
-dir_size_kb() {
-	local dir="$1"
-	if [[ -d "$dir" ]]; then
-		du -sk "$dir" 2>/dev/null | awk '{print $1}'
-	else
-		echo 0
-	fi
-}
-
-report() {
-	local label="$1" size_kb="$2" detail="${3:-}"
-	if ((size_kb > 0)); then
-		local hr
-		hr=$(human_readable "$size_kb")
-		printf "${YELLOW}%-40s${RESET} %10s" "$label" "$hr"
-		if [[ -n "$detail" ]]; then
-			printf "  ${CYAN}(%s)${RESET}" "$detail"
-		fi
-		printf "\n"
-		TOTAL_RECLAIMABLE=$((TOTAL_RECLAIMABLE + size_kb))
-	fi
-}
-
-# Returns 0 if user confirms, 1 otherwise. Always 1 in dry-run.
-confirm() {
-	local prompt="$1"
-	if $CLEAN; then
-		printf "${BOLD}  → %s [y/N]: ${RESET}" "$prompt"
-		read -r ans
-		if [[ "$ans" =~ ^[Yy]$ ]]; then
-			return 0
-		fi
-	fi
-	return 1
-}
-
-# Safe wrapper: confirm + action, never fails under errexit
-try_clean() {
-	local prompt="$1"
-	shift
-	if confirm "$prompt"; then
-		"$@"
-		printf "%s  ✓ Done%s\n" "${GREEN}" "${RESET}"
-	fi
-	return 0
-}
+# shellcheck source=./lib/disk_cleanup_common.sh
+source "$SCRIPT_DIR/lib/disk_cleanup_common.sh"
 
 # ───────────────────── checks ─────────────────────
 
@@ -286,44 +226,5 @@ if [[ -d "$aur_dir" ]]; then
 	fi
 fi
 
-# ───────────────────── report-only items ─────────────────────
-
-printf "\n%s--- Report-only (manual review needed) ---%s\n" "${BOLD}" "${RESET}"
-for manual_entry in \
-	"$HOME/Downloads/too_big:~/Downloads/too_big" \
-	"$HOME/Downloads:~/Downloads total" \
-	"$HOME/inne:~/inne" \
-	"/Games:/Games — still playing?"; do
-	dir="${manual_entry%%:*}"
-	label="${manual_entry#*:}"
-	size=$(dir_size_kb "$dir")
-	if ((size > 0)); then
-		hr=$(human_readable "$size")
-		printf "${RED}%-40s %10s${RESET}  ${CYAN}(review manually)${RESET}\n" \
-			"$label" "$hr"
-	fi
-done
-
-# ───────────────────── summary ─────────────────────
-
-printf "\n%s\n" "$(printf '%.0s─' {1..60})"
-total_hr=$(human_readable "$TOTAL_RECLAIMABLE")
-printf "${BOLD}Total auto-reclaimable:  ${GREEN}%s${RESET}\n" "$total_hr"
-
-read -r used_kb total_kb used_pct <<<"$(df -k / | awk 'NR==2{print $3, $2, $5}')"
-used_pct="${used_pct%\%}"
-printf "${BOLD}Current usage:           %s / %s (%s%%)${RESET}\n" \
-	"$(human_readable "$used_kb")" "$(human_readable "$total_kb")" "$used_pct"
-
-if ((TOTAL_RECLAIMABLE > 0)); then
-	new_used=$((used_kb - TOTAL_RECLAIMABLE))
-	if ((new_used < 0)); then new_used=0; fi
-	new_pct=$((new_used * 100 / total_kb))
-	printf "${BOLD}After cleanup:           %s / %s (%d%%)${RESET}\n" \
-		"$(human_readable "$new_used")" "$(human_readable "$total_kb")" "$new_pct"
-fi
-
-if ! $CLEAN; then
-	printf "\n%sRun with --clean to interactively clean each category.%s\n" "${CYAN}" "${RESET}"
-fi
-printf "\n"
+print_report_only
+print_summary
diff --git a/meta/scripts/lib/disk_cleanup_common.sh b/meta/scripts/lib/disk_cleanup_common.sh
new file mode 100755
index 00000000..b89f71fe
--- /dev/null
+++ b/meta/scripts/lib/disk_cleanup_common.sh
@@ -0,0 +1,124 @@
+#!/usr/bin/env bash
+# Formatting, sizing and confirmation helpers for disk_cleanup_check.sh.
+#
+# Split out to keep the entry script under the 250-line cap. The seam carries
+# state deliberately: `report` accumulates into TOTAL_RECLAIMABLE and `confirm`
+# reads CLEAN, both owned by the caller. Sourcing this file does not define
+# either -- the caller must set them first, which is what keeps the dry-run
+# default safe.
+#
+# shellcheck shell=bash
+
+RED=$'\033[0;31m'
+GREEN=$'\033[0;32m'
+YELLOW=$'\033[1;33m'
+CYAN=$'\033[0;36m'
+BOLD=$'\033[1m'
+RESET=$'\033[0m'
+
+human_readable() {
+	local kb=$1
+	if ((kb >= 1048576)); then
+		printf "%.1f GB" "$(echo "scale=1; $kb / 1048576" | bc)"
+	elif ((kb >= 1024)); then
+		printf "%.1f MB" "$(echo "scale=1; $kb / 1024" | bc)"
+	else
+		printf "%d KB" "$kb"
+	fi
+}
+
+dir_size_kb() {
+	local dir="$1"
+	if [[ -d "$dir" ]]; then
+		du -sk "$dir" 2>/dev/null | awk '{print $1}'
+	else
+		echo 0
+	fi
+}
+
+# Prints a row and adds to the caller's TOTAL_RECLAIMABLE. Silent for size 0.
+report() {
+	local label="$1" size_kb="$2" detail="${3:-}"
+	if ((size_kb > 0)); then
+		local hr
+		hr=$(human_readable "$size_kb")
+		printf "${YELLOW}%-40s${RESET} %10s" "$label" "$hr"
+		if [[ -n "$detail" ]]; then
+			printf "  ${CYAN}(%s)${RESET}" "$detail"
+		fi
+		printf "\n"
+		TOTAL_RECLAIMABLE=$((TOTAL_RECLAIMABLE + size_kb))
+	fi
+}
+
+# Returns 0 if user confirms, 1 otherwise. Always 1 in dry-run.
+confirm() {
+	local prompt="$1"
+	if $CLEAN; then
+		printf "${BOLD}  → %s [y/N]: ${RESET}" "$prompt"
+		read -r ans
+		if [[ "$ans" =~ ^[Yy]$ ]]; then
+			return 0
+		fi
+	fi
+	return 1
+}
+
+# Safe wrapper: confirm + action, never fails under errexit
+try_clean() {
+	local prompt="$1"
+	shift
+	if confirm "$prompt"; then
+		"$@"
+		printf "%s  ✓ Done%s\n" "${GREEN}" "${RESET}"
+	fi
+	return 0
+}
+
+# Directories that are never auto-cleaned: too personal to guess at, so they
+# are listed with sizes and left alone.
+print_report_only() {
+	printf "\n%s--- Report-only (manual review needed) ---%s\n" "${BOLD}" "${RESET}"
+	local manual_entry dir label size hr
+	for manual_entry in \
+		"$HOME/Downloads/too_big:~/Downloads/too_big" \
+		"$HOME/Downloads:~/Downloads total" \
+		"$HOME/inne:~/inne" \
+		"/Games:/Games — still playing?"; do
+		dir="${manual_entry%%:*}"
+		label="${manual_entry#*:}"
+		size=$(dir_size_kb "$dir")
+		if ((size > 0)); then
+			hr=$(human_readable "$size")
+			printf "${RED}%-40s %10s${RESET}  ${CYAN}(review manually)${RESET}\n" \
+				"$label" "$hr"
+		fi
+	done
+}
+
+# Totals plus a before/after projection against the real filesystem.
+print_summary() {
+	printf "\n%s\n" "$(printf '%.0s─' {1..60})"
+	local total_hr used_kb total_kb used_pct new_used new_pct
+	total_hr=$(human_readable "$TOTAL_RECLAIMABLE")
+	printf "${BOLD}Total auto-reclaimable:  ${GREEN}%s${RESET}\n" "$total_hr"
+
+	read -r used_kb total_kb used_pct <<<"$(df -k / | awk 'NR==2{print $3, $2, $5}')"
+	used_pct="${used_pct%\%}"
+	printf "${BOLD}Current usage:           %s / %s (%s%%)${RESET}\n" \
+		"$(human_readable "$used_kb")" "$(human_readable "$total_kb")" "$used_pct"
+
+	if ((TOTAL_RECLAIMABLE > 0)); then
+		new_used=$((used_kb - TOTAL_RECLAIMABLE))
+		if ((new_used < 0)); then new_used=0; fi
+		new_pct=$((new_used * 100 / total_kb))
+		printf "${BOLD}After cleanup:           %s / %s (%d%%)${RESET}\n" \
+			"$(human_readable "$new_used")" "$(human_readable "$total_kb")" "$new_pct"
+	fi
+
+	if ! $CLEAN; then
+		printf "\n%sRun with --clean to interactively clean each category.%s\n" \
+			"${CYAN}" "${RESET}"
+	fi
+	printf "\n"
+}